CLUSTER HELP RQD

Question

i am confused with cluster... after creating cluster.. how to query..? physically it stores the values of joining records. but how to view it..? pls help
create cluster emp_dept(deptno number(10));
CREATE TABLE dept1
    deptno NUMBER(10)   ,
    name   VARCHAR2(20),
    loc    VARCHAR2(20)
  cluster emp_dept
    deptno
create index IDX on cluster emp_dept;
drop table dept1
CREATE TABLE emp1
    empno  NUMBER(5)   ,
    name   VARCHAR2(20),
    sal    NUMBER(10,2),
    deptno NUMBER(10)
  cluster emp_dept
    deptno
  )SELECT * FROM EMP_DEPT ( Table or view does not exists error)
also help me what is cluster id here..
select  * from tab  where tname like 'EMP%'  OR  TNAME LIKE 'DEPT%'S

Answer 1

You dont query the cluster you just query the related tables joining them by the cluster key.
Cluster is a method of storage where data from different table are stored in the same block based on the cluster key.
you should try a query like the below
select e.empno, e.name, d.deptno, d.name
  from emp e
  join dept d
    on e.deptno = d.deptnoAnd if you check the explain plan then oracle would have accessed the cluster.